Sewing-machine



2 Shet-Sheet 1.

(Model) T. S. HUNTINGTON. SEWING MACHINE.

No. 247,357. Patnted Sept. 20,1881.

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IIN/Efliflf. o/vmw (ModeL) 2 Sheets--Sheet 2.

T. S. HUNTINGTON. SEWING MACHINE.

No. 247,357. 7 Patented Sept. 20,1881.

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v I e wen a UNITED STATES PATENT OFFICE.

THOMAS S. HUNTINGTON, OF NEW YORK, N. Y., ASSIGNOR TO THE GOLD MEDALMACHINE COMPANY, OF ORANGE, MASSACHUSETTS.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 247,357, datedSeptember 20, 1881.

Application filed March 5, 1881.

' To all whom z't may concern:

Be it knownthatI, THOMAS S. HUNTINGTON, of New York, county and State ofNew York, have invented Improvements in Sewing-Machines, of which thefollowing description, in connection with the accompanying drawings, isa specification.

This invention relates to improvements in' sewing-machinesofthatclasswherein the shut- IO tle oscillates in the arc of a circle about ahorizontalaxis, the shuttlederivingits motion from a rock-shaft.

My improvements relate to means for operatin g the sh uttle-carryingrock-sh aft, whereby all tendency of the oscillating shuttle to movebeyond its established points in each directionis overcome,notwithstandingvariationsin speed.

It is well known that oscillating shuttles actuated from rock-shaftshave their throw or movementin each direction increased with eachincrease of speed, and in running such a machine at high speed (it atslow speed workingproperly) there is such an increase of move ment ofthe shuttle, owing chiefly to momentum,-a s to break the shuttle-threadand seriously aflect the stitch by pulling from the sh uttle at highspeed more thread than is drawn from the shuttle at the average or slowspeed ofthemachinethespeedatwhichthemachine is for the most part worked.This additional slack in the shuttle-thread destroys the uniformappearance of the stitch. To obviate the difficulties arising from theoverthrow of the shuttle, the thread has been delivered from the shuttlenear the center of its oscillation, the delivery of the shuttle-threadout of center being just sufficient to allow slack thread, just as thefeed takes place; but as the material increases in thickness or thestitch in length, the amount of slack thread provided for by thedelivery of the shuttle-thread a little out of the center of oscillationof the shuttle is so small as to be inadequate and breaks theshuttle-thread orpuckers the goods. These same diftioulties are alsoproduced by overthrow.

In my improved machine I employ a'sliding pin on a connecting-rod,whichpin, before entering the slot in the crank-arm of the oscil- (ModeL)lating shuttle-moving rock-shaft, is extended through a slot of aguide-block, the latter so controlling the movement of the said pin asto cause it to move the said crank and rock-shaft only a certainpredetermined distance, no matter at What speed the machine is run, thuscompletely obviating all evil effects from overthrow. The slot in thisguide-block is made more or less irregular or out of line with relationto the axis of the said rock-shaft, to cause 6 the said pin to approachtoward or recede from the axis of the said rock-shaft in the slot of thesaid crank and vary the velocity of the shuttle at certain portions ofits travel-as, for instance, to move it rather slowly until the 6 pointof the shuttle enters the loop of needlethread, when the speed of theshuttle is gradually increased until the shuttle passes throughtheloop,butisagainmoved slowlyasitcomes to its most forward position,where it rests while the take-up, which commencedto rise before theshuttle finished its passage through the loop, completes its rise,operates and finishes the stitch just made, the shuttle completing itsforward movementjust as the takeup finishes its upward movement, theneedle-bar being also at its highest throw.

By giving to the shuttle an irregular movement I am enabled to actuatethe needle-bar at a uniform rate of movement, and thus ob- 8o viate theuse of a heart-cam or the so-callcd dip motion of the needle-bar to makeslack in the needle-thread for the passage of the shuttle.

My shuttle is arranged to oscillate within an annular chamber, and issupported upon a shuttle-rest hinged to a plate or disk connected withthe shuttle-actuating rock-shaft, the said rest having connected with ita sh uttle-holder, which holds the shuttle pressed up against the 0 saidplate or disk.

The take-up is composed of a sector or arm having an irregular slot, andpivoted at one side of the center of the needle-bar-moving shaft. Thesector derives its movement from 5 the rotating crank-pin which movesthe needle-bar, the crank-pin entering a straight slot in a block atright angles to the needle-bar. This sector, owing to the location ofits pivot and theshape of its slot, has given to it a vazoo s cause ittomove up to and catch theloop of neeriable motion, the sector movingslowest as the crank-pin descends to pass its lower center,

the speed of the sector gradually increasing as the said crank-pin risesfrom its lower to its highest center. are of a circle, engage a pinionattached to a shaft having adj ustably secured to it the takeup arm, thelatter thus having given to it motion in the arc of a circle of greateror less radius.

Figure 1 is a side elevation of a sewing-machine containing myimprovements, the framework being partially broken away; Fig. 2, anunder-side view thereof, thefeedingmeehanism beingomitted ;Fig.3,apartial cross-section and front view of the head, with the face-plateof the head removed to show the take-up-moving devices, the needle-barbeing partially broken out. Fig. 4 is a detail of the guide-block,.theforked crank or arm at the end of the oscillating shuttle-movin g shaft,and the sliding pin 5 and Fig. 5, an inner-side view of the needlebar.

The frame-work a of the machine, the main rotating shaft a, crank-pin athe vertical shaft a the gears a a and the counterbalanced crank a atitslower end, are, as herein shown,

all as in the Singer sewing-machine, and need not, therefore, beparticularly described.

Home machine.

of the frame or bed of the machine at N.

a pin,d, which I shall hereinafter denomiuate the sliding pin. This pinis extended through the slot 6 in the guide-block 0, herein shown asfixed to the under side of the frame or bed of the machine. The outerend of this pin is made to enter a slot in the crank-army, secured tothe horizontal rock-shaft f, supported in suitable bearings, and havingat its other end the arm or disk f against which the inner side of theshuttle g is kept pressed by the holder 9, secured to the shuttle-rest gpivoted or hinged to the said arm or disk f at 2. The forward part ofthe connecting-rod c is acted upon at its outer side by a ledge, c,which serves to keep the pin (I pressed into the slot in the crankf.The slot cin this guide-block, shaped as shown in Fig. 4, is curvedirregularly with relation to the center of the rockshaft f, (denoted indotted lines in the said figure,) and the slidingpin d, owing toltheshape of the said slot 0, is made to approach toward and recede from thecenter of the said rockshaft in the groove of the said arm f, as thesliding pin is moved by the connecting-rod 0, thus accelerating andlessening the speed of the shuttle during portions of each stroke, to

The teeth of the sector, in thedle-thread slowly and thereafter movefaster while passing through the said loop, and then continuing itsforward movement more slowly, and finally almost stopping near itsextreme forward position for the take-up to finish the stitch. Thissliding pin, loosely connected with the crank-arm f, and guided in thisway by the slot 0 of the guide-block 0, always operates the saidcrank-arm and rock-shaft for just the same distance at each forwardmovement of the sliding pin. and causes it to carry the point of theshuttle forward to just the same point at whatever speed the shaft to ofthe machine may be run, thus completely obviating alldifficulty arisingfrom overthrow ofthe shu ttle and improper strainon the shuttle-thread,as before explained.

The holder and rest are held up in operative position by a rest-lockingdevice, It, shown as a turn-button.

The shuttle gcontains a disk-bobbin of usual construction, looselyplaced in a recess fromv The shuttle on its back-stroke gives up slackThe feeding devices, omitted from the draw-- ings because not of myinvention, maybe as in the Singer family machine or as in the New;

thread for the feed, substantially as do the machines hereinbeforereferred to. This shuttle is made to oscillate in a circular cavity;

The balanced crank a, as herein shown, is provided with a pin, I), whichenters 2LS10l3,b',i in a radius-bar, b pivoted to the under side. This;radius-bar at its front end has joined with itE the connecting-rod 0,having at its forward end but it may be readily removed therefrom byturning the shuttle-rest out from the said cavity, and the shuttle may,if desired, be removed and its tension altered without breaking theshuttle-thread or disturbing the material under the presser-foot.

The crankpin (6 carried by the usual disk at the end of shaft to andprovided with the usual friction-roller, is extended through theirregular slot t in the arm or sector It, pivoted at It at one side thecenter of shaft a. The teeth 3 of this sector engage the teeth of thepinion-k on the short shaft or stud having adjustably attached to it thetake-up it, it having at its end a hole or eye, 4:, to receive theneedle-thread extended from the usual needlethread tension device Iunder the loop 1, Fig. 3, and up through the stationary eye Z Fig. 1,the needle-thread led through the said eye 4 being then led back throughthe eye 1 into and through the eye 5 at the lower end of the needle baron the needle fastening screw through the eye of the usual needle fromits front side. Just after the needle-bar begins to descend the take-upcommences to descend in I J arc of a circle, and continues to so moveuntil its lower end passes beyond the eye Z During this time the shuttleenters and passes about half-way through the loop of needlethread, whenthe shuttle, to move farther forward and not break the needle-thread,demands more thread from the needle and take up. Theneedle-thread sodemanded is quickly supplied by the take-up, which is then moved back,giving up a little slack thread, which enables the largestpart of theshuttle to pass through the loop of needle-thread, and as the shuttlecompletes the latter part of its passage through the said loop thetake-up rises and accelerates the passage of the loop of needlethreadfrom the heel of the shuttle and takes up the slack in theneedle-thread. The needle-bar is substantially at its highest point whenthe heel of the shuttle passes through the loop of needle-thread, and atsuch time the take-up commences to rise rapidly to take up the slackthread, and completes its upward motion just before the needle startsdown.

The pivot of the take-up sectoris located at one side the center of theshaft carrying the crank-pin which moves the said sector, and the slotin the sector is of such shape, in connection with the position of itspivot, that the crank-pin moves the take-up faster when the needle-barrises than when it descends, thus giving all the time possible for theshuttle to get through the loop of needle-thread, and the time isdifferent than were the pinion of the take-up driven from the needle-baror at its speed. The crank-pin a after passing through the slot in thesector, enters a straight slot, W, in a block, m, secured to theneedle-bar m.

I do not desire to limit my invention to the exact devices shown forreciprocating the connectingrod c from the rotating shaft of themachine, as I may employ for such purpose any other well-known mechanismemployed in shuttle sewing-machines to reciprocate aborizontal rodlengthwise of the cloth-supporting bed. I do not broadly claim anoscillating take-up operated by a rack and pinion moving in unison withthe needle-bar,- as I am aware that that kind of a take-up is old.

I claim 1. In a sewing-machine employing an eyepointed needle, anoscillating shuttle, a rest, and rock-shaft provided with an arm orcrank,

combined with connecting-rod and sliding pin loosely connected with thesaid arm or crank, and aslotted guide-block to directthe said pin,substantially as and for the purpose described.

2. The reciprocating connecting-rod and its attached sliding pin,combined with the guideblock provided with an irregular slot, 0, throughwhich the said pin is extended, and with the arm of a shuttle-movingrock-shaft, with whichthe said pin is loosely connected, whereby thesliding pin is caused to approach toward and reeede from the center ofthe said rock-shaft at each-movement of the rock-shaft in each directionto vary the speed of the shuttle, substantially as described.

3. The reciprocating rod 0 and its sliding pin, combined with theslotted guide-block, and the ledge to act upon one side of theconnecting-rod and retain the said pin in the slot of the said block,substantially as described.

4. The sector pivoted as described, and crank-pin to move it atavariable speed, combined with the take-up and pinion secured to theshaft of the take-up and operated by the sector, substantially asdescribed.

5. In a sewing-machine, a needle-bar and eyepointed needle having auniform ascending and descending movement, combined with a take-uphaving a variable movement in its ascent and descent, and with the shuttle-carrier, and the semicircular shuttle 9, adapted to oscillate, asdescribed, aboutits own center, and with means to operate the carrierand shuttle at a variable speed at each forward and backward movementand prevent overrunning of the shuttle, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOMAS S. HUNTINGTON.

\Vitnesses:

G. W. GREGORY, W. H. Sresrron.

